Enable Clang warnings in .cc files for Linux+[Aura/ChromeOS]

chromeos/network/network_state_unittest.cc

Index: chromeos/network/network_state_unittest.cc
diff --git a/chromeos/network/network_state_unittest.cc b/chromeos/network/network_state_unittest.cc
index 7c7bc418941b7480d21e8736b58b1db341a1b57c..0ccdd198dbd1f0c7f944bf282109e68ee9d3490d 100644
--- a/chromeos/network/network_state_unittest.cc
+++ b/chromeos/network/network_state_unittest.cc
@@ -17,12 +17,12 @@ namespace {
 
 class TestStringValue : public base::Value {
  public:
-  TestStringValue(const std::string& in_value)
+  explicit TestStringValue(const std::string& in_value)
       : base::Value(TYPE_STRING),
         value_(in_value) {
   }
 
-  ~TestStringValue() {
+  virtual ~TestStringValue() {
   }
 
   // Overridden from Value: